<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
</head>
<body>
	<h1>hello world</h1>
</body>
</html>
<script type="text/javascript">
	var a=0;
	for(var i=0;i<10;i++){
		var a=1;
		var b=a;
	}
</script>